DE3441468A1 - PNEUMATIC POWER TOOL - Google Patents

Description

HOEGER, STELLRECHT & PARTNER g ^ ^ -j ^ gg

PATENT LAWYERS

UHUANDSTRASSE 14C-D 7000 Stuttgart 1

- 5th

A 46 377 b Applicant: Desoutter Limited

k- 176 319 Edgware Road, Colindale

November 12, 1984 London NW9 6ND

Great Britain

Pneumatic power tool

The invention relates to a pneumatic power tool, in particular according to the generic term of the patent claim 1, as well as a method for assembling such a power tool.

Pneumatically operated power tools such as screwdrivers., Grinding machines and drills are known in different variants. Some of that force " tools have theirs from the respective tool insert remote rear end an exhaust air outlet which is arranged concentrically zu.einem air inlet while Other power tools have an exhaust outlet at the rear end that is offset from the air inlet is. Power tools of the first type are usually used, if not intentional consists of collecting and filtering the exhaust air, while power tools of the second type are then used, when the exhaust air is to be collected and filtered. In a third type of pneumatic power tool the exhaust air exits at the front end. In addition, some power tools work with reversible motors,

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A 46 377 b

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November 12, 1984

while others only run with a given direction of rotation, whereby for the start-up of the power tools various differently designed activation mechanisms, be used. The wide range of power tools outlined above leads because of the relatively small number of items per type at high manufacturing costs, whereby the user often has the need results in buying several different power tools.

The invention is based on the object, on the one hand, of reducing the production costs for pneumatic power tools lower and on the other hand a high flexibility for the user with regard to the possible uses of a to create power tools acquired by him.

This task is achieved in particular with a power tool of the specified type by the features of Characteristic part des.Anspruchs 1 solved. Beneficial Refinements of the power tool according to claim 1 are specified in the subclaims 2 to 6. Further advantageous variants of the invention are Subject of claims 7, 8 and 9.

As the claims in their entirety show, one can say that the object of the invention is the element construction of pneumatic power tools, with the individual power tool depending on the respective requirements made up of a power tool body and various exchangeable control parts and / or adapters will.

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A 46 377 b

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November 12, 1984

The invention is explained below with reference to drawings explained in more detail. Show it:

1 shows a longitudinal section through a control part and an adapter connected to it for ein.Kraftwerkzeug according to the invention;

2 shows a longitudinal section through a control part / adapter arrangement for a power tool according to the invention with switching devices different from the embodiment according to FIG. 1;

3 shows an end view of the left end of the control part according to FIGS. 1 and 2;

Fig. 4 is a cross-section along the line A-A in Fig. 1;

Fig. 5 is a partial cross-section along the line B-B in Fig. 1;

Fig. 6 longitudinal sections or partial longitudinal sections through control part / adapter arrangements 9 of a power tool according to the invention

with different switch-on unit

services;

Fig. 10 is an end view of the left end of the Control part according to FIGS. 6 to 9 and

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A 46 377 b

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November 12, 1984

11 shows longitudinal sections through two modified ones and adapter embodiments for Kraft-Fig. 12 tools according to the invention.

In detail, FIGS. 1 to 5 show a control part 10 and an adapter 18 of a pneumatic power tool. The control part 10 is designed so that it reverses the direction of rotation of the associated power tool and has a valve 11 which can be actuated via an actuation button and has a “coil-shaped Valve part on. The valve 11 is used to supply compressed air to the pneumatic motor (not shown) via an opening 12 or through an opening 13 .. The control part 11 further comprises a resiliently preloaded valve element in the form of a ball 14, which by a spring 15 against a seat 16 in an air inlet duct

17 of the control part 10 is pressed. The adapter 18 is a socket-shaped plastic part which is attached to its one end is provided with an outwardly open annular groove 19 in which an O-ring 20 is located. The adapter

18 is in the rear, in Fig. 1 right end of the control part 10 pressed in. In the adapter two annular filters 21 and 22 are arranged, between which a spacer element 23 is located. The adapter 18 is on the control part 10 by means of a socket 24 with two O-ring seals 25 and 26 are detachably attached. To the one end of the socket 24 is integrally formed with a nut 27, the inside of which is attached to the outside of the

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A 46 377 b

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12th November 1984

Filters 22 applies. The socket 24 is provided at its other end with an external thread 28, which in an internal thread of the inlet channel 17 of the control part 10 is screwed in. An air supply line (not shown) is provided with the nut 27. end the. Bushing 24 attached, and the air .Will in the engine via the air inlet duct 17 and as a function of the .Position of the valve 11 via one of the openings 12 or .13 fed. The air leaves the motor via an arcuate opening 29, which is connected to the adapter 18. Is in communication via a channel 30 in the control part 10. From the above description it is clear that the. Adapter 18 defines an outlet which surrounds the air inlet for the tool and which is normally Then it is used when it is not desired to collect and filter the exhaust air from the pneumatic motor. A tubular one. Plastic cover (not shown) can be pushed onto the adapter 18 and attached to it by means of an inner projection are held, which with an outwardly open annular groove 18 ' of the adapter 18 is locked. Of the. Plating would be in In this case end at some distance from the control part 10, um.die exhaust air only at a certain distance released into the environment by an operator using the power tool.

Instead of the valve 11 actuated by a push button, a corresponding spring-loaded valve could be used be provided, which could be remotely controlled by means of compressed air.

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November 12, 1984

The control part is manufactured as a cast part / whereby the control parts shown in Figs. 1 and 2 are substantially the same. The control part 10 according to FIG. 1 is but for use in conjunction with an automatic starting tool suitable, which is designed such that when pressure is applied to the tool holder by pressing a drill or the like against a workpiece, etc. an.axial displacement of a elongated "element · 31 takes place through which the ball 14 is lifted from its seat 16 against the spring force of the spring 15.

The control part List shown in Fig. 2 for use in connection with a lever on switch which comprises a lever 32 which is attached to the housing of the Control part is articulated with the help of a pin 33 and a button or a button element 34, which with a pivoting movement of the lever 32 inwards (counterclockwise) the ball 14 lifts from its seat 16, by moving them to the side and back.

The hole in the control part, which receives the element 34, is not provided in the control part of FIG. 1 in its top, but is as required manufactured in such a control part. However, an opening for the pin 33 is already provided, which however, according to FIG. 5, in the exemplary embodiment according to FIG. 1, it is closed with a plastic stopper 35.

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November 12, 1984

The power tool could instead of the pressure]: nopfventi Is 11 or the lever switch 3.2 also have an annular throttle. The control part according to FIGS. 1 to 5 can also with that shown in FIG. Adapter. Be equipped. The adapter 18a shown there is a cranked plastic part without filter, with an outlet opening 36 laterally or radially opposite the air inlet of the tool offset. is. The adapter 18a is normally used when the exhaust air is collected and filtered is to be, with the adapter 18a usually an exhaust hose is connected. Instead, however, a silencer can also be attached to the adapter 18a according to FIG. 11 37 screwed on.

The control part 10 according to FIGS. 1 to 5 can also be used in Connection to the adapter 18b shown in FIG. 12 can be used. This adapter 18b. Is designed so that it prevents exhaust air from escaping at the rear or at the rear end of the control part, and has the shape of a stepped socket. A section 38 larger. Diameter of this socket is. under use an O-ring 38 'sealingly in the control part 10 used, while a section 39 of smaller diameter using an O-ring 40 sealing with respect to the socket 24 is set. The adapter 18b shown in FIG. 12 is then used if so desired is to discharge the exhaust air from the engine from the front end of the tool, in this case at the front Tool end one or more outlet openings must be provided.

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3UU68

Λ 4 6 377 b

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November 12, 1984

In Fig. 6 to 9 is a modified embodiment a control part 10 for use in connection with the adapter 18 according to FIGS. 1 and 2 shown. The control part 10 according to FIGS. 6 to 9 is that according to FIG. 1 and 2 very similar / but with no provisions for. Installation of the push button valve 11 for reversing the direction of rotation of the engine are provided. The air inlet duct ends, rather in a recess 41 (cf. Fig. 10) of the control part 10 / while an arcuate one Outlet opening 4 2 leads to an exhaust duct 30. As FIG. 10 shows, the control part 10 has two blind bores .44 and 45. With this configuration of the control part, the pneumatic motor is attached to the Part of the tool housing has a small pin arranged so that it can be inserted into one of the blind bores 44 or 45 fits, depending on which of the bores the pin engages in, the motor the recess 41 and the outlet opening 42 occupies such a position that it is in contact with one or the other Direction of rotation moved. The control part 10 according to FIG. 6 is again equipped with corresponding devices (element 31) equipped for an automatic tool start-up, like the control part according to FIG. 1, while the one shown in FIG. 8 shown control part similar to the one in Fig. 2 has a lever engagement mechanism. The one in Fig. 7 The control part shown has a push-button switch-on mechanism, the lever of the switch-on mechanism 2 and 8 is simply replaced by a head which is releasably attached to the outer end of the element 34 is.

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November 12, 1983

The one in Pig. 9 has control part 10 shown: on lever engaging mechanism, however, is provided with a safety device that prevents accidental actuation of the lever, as described in detail in GB-PS 20 70.207. The control units 10 6 to 9 can also be used in conjunction with the adapter 18a of FIG. 1T or in conjunction with the adapters 18b shown in FIG. 12 are used, in the same way as described above.

From the foregoing description it can be seen that a number of different power tools can be seen can be made cheaper and that the user can change his tool from a reversible tool a non-reversible. Tool (or, vice versa) can be converted, with the exhaust air at the rear end of the tool concentric to the supply air or opposite the air inlet can emerge offset or also, at the front end, of the tool, with, moreover, different Activation mechanisms can be used. In other words, the invention can be seen therein a kit with several convertible main tool parts (including the motor) as well Sets of different control units and adapters provide, the individual structural units der-. art are interchangeable that the main tool parts the control parts and the adapters are assembled to form different pneumatic power tools can.

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Claims (1)

HOEGER ₁ LEGAL RIGHT & PARTNER 3 ^ ^ - | PATENTANWÄLTE UHLANDSTRASSE 14 c D 70OO STUTTGART 1 A 46 377 b Applicant: Desoutter Limited k- 176 319 Edgware Road, Colindale November 12, 1984 London NW9 6ND Great Britain Claims 1. Pneumatic power tool with a tool base body in which a pneumatic motor is arranged, and with a control part in which an air inlet duct and duct devices are provided, via which air can be fed to the motor from the inlet duct, and with valve devices which can be selectively actuated are to provide an air supply to the engine to release or block, characterized gekennzeichne t _f that at least two adapters (18,18a) are provided, which are selectively connectable to the controlled (10) and of which defines a one outlet opening, which has a Surrounding air inlet to the engine, and the other of which defines an outlet opening which is offset from the air inlet. 2. Power tool according to claim 1, characterized in that each adapter (18,18a) fits into a opening of the control part (10) can be pressed in and is held there by a bushing (24) which defines the air inlet to the engine and which the adapter (18,18a) passes through and with the Air inlet surrounding wall of the control part (10) is screwed. - 0 - A 46 377 b k - 176 - 2 - November 12, 1984 3. Tool according to claim 1 or 2, characterized in that the control part (10) has a substantially has a cylindrical shape that the control part (10) is designed such that an air inlet duct and an exhaust air outlet duct with its rear end facing away from a tool holder are connected, and that the adapter (18,18a) connectable to the rear end of the control part (10) are. 4. A power tool according to claim 3, characterized in that a further adapter (18b) is provided, with the aid of which the rear end of the control ^part: related Abluftauslaßkanal is selectively lockable. 5. Power tool according to one of claims 1 to 4, characterized in that a.erster and a second control part (10) are provided, one of which is designed such that it is a reversal of the motor and of which the other is designed in such a way that it does not reverse of the motor allows, depending on the desired operating mode, one or the other control part (10) is connected to the other elements of the power tool. 6. Power tool according to claim 5, characterized in that each control part (10) is designed such .that it can be selectively equipped with at least two different power tool activation mechanisms (32,33,34) is. -3- A 46 377 b k - 176 - 3 - November 12, 1984 7. Pneumatic power tool with a tool body, in which a pneumatic motor is arranged, and with switching devices for switching on and off of the engine, in particular according to one of claims 1 to 6, characterized in that the power plant with a releasably attached adapter (18,18a) is equipped, which defi-. niert having an air inlet to the power tool surrounds, and. that this adapter (18,18a) against a further adapter (18,18a) is exchangeable, which one. Exhaust air outlet defined opposite the Air inlet to the power tool is offset, or vice versa. 8. Pneumatic power tool with a tool body in which a pneumatic motor is arranged, and with a control part in which an inlet channel and channel devices are provided via the air is feedable to the engine from the intake port, and with valve means which are selectively operable are to enable or interrupt the air supply to the engine, characterized in that, that the .Steuteil (10) is releasably attachable and designed such that it is when connected to the other elements of the power tool allows a reversal of the same and also against one other control part (10) is exchangeable, when using the power tool cannot be reversed, or the other way around. A 46 377 b k - 176 - 4 - November 12, 1984 Method for assembling a pneumatic power tool, characterized by the following process steps: a) man. starts with a power tool body, in which a pneumatic motor is arranged or which is suitable for receiving a pneumatic motor is and facilities for switching the engine on and off, as well as with an adapter that an exhaust outlet defining an air inlet for the power tool surrounds, and with another adapter that defines an exhaust air outlet, which is offset from the air inlet for the power tool, and b) one selectively connects one or the other adapter with the power tool base body.